This is mostly useful when a page has moved, to keep the guids for
pages unchanged and
- [[avoid_flooding_aggregators|howto_avoid_flooding_aggregators]].
+ [[avoid_flooding_aggregators|tips/howto_avoid_flooding_aggregators]].
If the field is not one of the above predefined fields, the metadata will be
written to the generated html page as a <meta> header. However, this